#747681

CSS

:root {
  --abandoned-spaceship: #747681;
  --abandoned-spaceship-rgb: 116 118 129;
  --abandoned-spaceship-oklch: oklch(0.568 0.017 277.6);
}

.element {
  color: var(--abandoned-spaceship);
  background-color: hsl(231 5% 48%);
  border-color: oklch(0.568 0.017 277.6);
}

Tailwind CSS v4

@theme {
  --color-abandoned-spaceship: #747681;
  --color-abandoned-spaceship-50: #f4f5fa;
  --color-abandoned-spaceship-100: #e6e7ee;
  --color-abandoned-spaceship-200: #d2d4dc;
  --color-abandoned-spaceship-300: #b5b7c0;
  --color-abandoned-spaceship-400: #9c9ea9;
  --color-abandoned-spaceship-500: #838592;
  --color-abandoned-spaceship-600: #6f717b;
  --color-abandoned-spaceship-700: #595a63;
  --color-abandoned-spaceship-800: #414248;
  --color-abandoned-spaceship-900: #2c2e32;
  --color-abandoned-spaceship-950: #1a1a1e;
}

SCSS

$abandoned-spaceship: #747681;
$abandoned-spaceship-rgb: 116, 118, 129;
$abandoned-spaceship-light: mix(#fff, $abandoned-spaceship, 20%);
$abandoned-spaceship-dark: mix(#000, $abandoned-spaceship, 20%);

.element {
  color: $abandoned-spaceship;
  box-shadow: 0 0 0 2px rgba($abandoned-spaceship, 0.35);
}